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I've been having this same problem, it's been bugging me for months, then it came to me out of the blue this afternoon. The DPFE sensor which replaces the MAP sensor on new vehicles. If it goes bad it can cause misfires and a lean situation. So I unplugged it this afternoon, no misfire sense

#1 is the egr position sensor #4 Is for single cylinder misfire so this could be the coil or a bad plug or wire ..but with fords should check for a vacume leak that can cause a misfire to .....#2#3 are 02 sensors before i would change them i would check the mass air flow sensor ..Hope this helps

have your idle speed sensor cleaned,also checkd the air flow sensor located in the air cleaner housing,you best bet is to have it scanned for PCM soft codes(codes that wont turn on the check engine light on)

pinging noise low octane. mix gasoline half and half.half 87 and half 89.run it severals days if it still ping have it scan to check detonation sensor.a bad detonation sensor will also make car ping alot.

fist unclip wire,then unscrew it with a 28mm spanner ,fitting procedure is the reverse .It turns anticlockwise to unscrew and clockwise to screw up ,torque setting is a grunt and two scuffed knuckles and max of 3 swear words